Acronyms used at Diablo Canyon Nuclear Power Plant (DCPP)

The following alphabetical listing contains abbreviations, acronyms, compound words, technical symbols, and spelling preferred for licensing and other regulatory correspondence.

Letter Acronym Definition
A AMSAC

ATWS mitigation system actuation circuitry

A Abs

Absolute

A ASP

Accident sequence precursor (PRA term)

A Acre-ft

Acre-foot

A AE

Action Evaluation

A AR

Action Request

A ALJ

Administrative Law Judge

A AL

Administrative Letter (NRC)

A ACRS

Advisory Committee on Reactor Safeguards

A

Aftercooler

A

Air-cooled

A

All-inclusive

A AVT

All volatile treatment

A AOT

Allowed outage time

A ARC

Alternate repair criteria

A Ac

Alternating current

A ACI

American Concrete Institute

A AIEE

American Institute of Electrical Engineers

A AISC

American Institute of Steel Construction

A ANSI

American National Standards Institute

A ANEC

American Nuclear Energy Council

A ANI

American Nuclear Insurers

A ANS

American Nuclear Society

A API

American Petroleum Institute

A ASTM

American Society for Testing and Materials

A ASCE

American Society of Civil Engineers

A ASME

American Society of Mechanical Engineers

A ASA

American Standards Association

A AWS

American Welding Society

A AWG

American wire gauge

A A/amp

Ampere

A A-hr/amp-hr

Ampere-hour

A A/cm2

Ampere per square centimeter

A AM

Amplitude modulation

A A.m.

Ante meridiem-before noon

A ATWS

Anticipated transient without scram

A ATWT

Anticipated transient without trip

A Antilog/log-1

Antilogarithm

A

Antireverse

A AVB

Antivibration bar

A

As-built (adj or noun)

A ALARA

As low as is reasonably achievable

A Atm

Atmosphere

A AEC

Atomic Energy Commission

A AIF

Atomic Industrial Forum

A ASLAB

Atomic Safety and Licensing Appeal Board

A ASLB

Atomic Safety and Licensing Board

A At. no.

Atomic number

A At. %

Atomic percent

A At. wt

Atomic weight

A AFR

Audit Finding Report

A AIT

Augmented inspection team (NRC)

A ANI

Authorized Nuclear Inspector

A ACI

Autoclosure interlock

A

Autostart

A

Autostop

A AB

Auxiliary building

A AFW

Auxiliary feedwater

A ASW

Auxiliary saltwater

A Avg

Average

A AO

Axial offset

A AOC

Axial offset control

B BN

Board Notification

B B&PV

Boiler and Pressure Vessel (Code)

B BTP

Branch Technical Position (NRC)

B Btu

British thermal unit

C CDFG

California Department of Fish and Game

C CDF

California Department of Forestry

C CDMG

California Division of Mines and Geology

C CPUC

California Public Utilities Commission

C CRWQCB

California Regional Water Quality Control Board

C C

Celsius

C CCRWQCB

Central Coast Regional Water Quality Control Board

C C of C

Certificate of Compliance

C CMTR

Certified Material Test Report

C CFR

Code of Federal Regulations

C CRGR

Committee to Review Generic Requirements (NRC)

C COLR

Core Operating Limits Report

C CERP

Corporate Emergency Response Plan

C CIRC

Corporate Incident Response Center

C CCC

Correspondence control center

D DLAP

Department-Level Administrative Procedure

D DOD

Department of Defense

D DOE

Department of Energy

D DER

Department of Engineering Research

D DHS

Department of Health Services (California)

D DPH

Department of Public Health (county)

D DOT

Department of Transportation

D DBM

Design Basis Management

D DCM

Design Criteria Memorandum

D DCISC

Diablo Canyon Independent Safety Committee

D DCL-98-XXX

Diablo Canyon Letter

D DCPP

Diablo Canyon Nuclear Power Plant

D DCPRA

Diablo Canyon probabilistic risk assessment

D DR

Discrepancy Report or Deviation Report

D D.C.

District of Columbia

D DC

District of Columbia (in address with zipcode)

D DPR

Division of Power Reactors (AEC)

D DES

Draft Environmental Statement (NRC)

E EEI

Edison Electric Institute

E EPRI

Electric Power Research Institute

E EOC

Emergency Operations Center

E EOF

Emergency Operations Facility

E ERF

Emergency Response Facility

E ERFDS

Emergency Response Facility Data System

E ERMC

Emergency Response Media Center

E ERP

Emergency Response Plan

E ES (also OES)

Emergency Services, California Office of

E EIC

Energy Information Center

E ERDA

Energy Research and Development Administration

E ES

Engineering Services

E EIS

Environmental Impact Statement

E EPA

Environmental Protection Agency (U.S. government)

E EPP

Environmental Protection Plan

E ER

Environmental Report

E EIT

Event Investigation Team

E ERT

Event Response Team

E EDO

Executive Director for Operations (NRC)

F F

Fahrenheit

F f

Farad

F FEMA

Federal Emergency Management Administration

F FERC

Federal Energy Regulatory Commission

F FR

Federal Register

F FWPCA

Federal Water Pollution Control Act

F FWQA

Federal Water Quality Act

F FES

Final Environmental Statement

F FSAR

Final Safety Analysis Report

F FPP

Fire Protection Program

F FTI

Framatome Technologies, Inc.

F FOIA

Freedom of Information Act

G GL

Generic Letter

H HWMP

Hazardous Waste Minimization Program

H HIT

High Impact Team

H HI-STAR

Holtec International Storage, Transport and Repository

H HI-STORM

Holtec International Storage and Transfer Operation Reinforced Module

H HE

Hosgri earthquake

H HBL-98-XXX

Humboldt Bay Letter

H HBPP

Humboldt Bay Power Plant

I Ibid.

Ibidem (in the same place)

I ITS

Improved Technical Specifications

I IDVP

Independent Design Verification Program

I ISC

Independent Safety Committee

I IR

Inspection Report (NRC)

I IEEE

Institute of Electrical and Electronics Engineers

I INPO

Institute of Nuclear Power Operations

I ISA

Instrument Society of America

I IIT

Integrated Inspection Team

I ISAP

Integrated Safety Assessment Program

I IDAP

Inter-Departmental Administrative Procedure

I ICRP

International Commission on Radiation Protection

I SI

International System of Units (Standard International)

J JCAE

Joint Committee on Atomic Energy

J JMC

Joint Media Center

L LER

Licensee Event Report

L LIS

Licensing Information Service

L LDBAP

Licensing and Design Bases Alignment Program

L LTSP

Long Term Seismic Program

L LPMS

Loose Parts Monitor System

M MAS

Management Action System (PIMS)

M MM

Mechanical Maintenance

M

Mode 2 (Startup)

M

Mode 3 (Hot Standby)

M

Mode 4 (Hot Shutdown)

M

Mode 5 (Cold Shutdown)

M

Mode 6 (Refueling)

M

Mode l (Power Operation)

M MAAP

Modular Accident Analysis Program

M MFP

Mothers for Peace

N NBFU

National Board of Fire Underwriters

N NBS

National Bureau of Standards

N NEC

National Electric Code

N NEMA

National Electrical Manufacturer's Association

N NEPA

National Environmental Policy Act

N NFPA

National Fire Protection Association

N NFPC

National Fire Protection Code

N NPDES

National Pollutant Discharge Elimination System

N NCR

Nonconformance Report

N NOD

Notice of Deviation

N NOV

Notice of Violation

N NEI

Nuclear Energy Institute

N NEI-98-XXX

Nuclear Energy Institute Letter

N NUMARC

Nuclear Management and Resources Council

N NMSS

Nuclear Material Safety and Safeguards (NRC)

N NPAP

Nuclear Plant Administrative Procedure

N NPPR

Nuclear Plant Problem Report

N NPRDS

Nuclear Plant Reliability Data System

N NPG

Nuclear Power Generation

N NQS

Nuclear Quality Services

N NRR

Nuclear Reactor Regulation (NRC)

N NSOC

Nuclear Safety Oversight Committee

N NTS

Nuclear Technical Services

N NUFPG

Nuclear Utility Fire Protection Group

O OSHA

Occupational Safety and Health Administration

O AEOD

Office for the Analysis and Evaluation of Operational Data (NRC)

O OES (also ES)

Office of Emergency Services (State)

O OIE or IE

Office of Inspection and Enforcement (State)

O IG

Office of Inspector General (NRC)

O NMSS

Office of Nuclear Material Safety and Safeguards (NRC)

O ODES

Onsite Dosimetry and Environmental Services

O OMMS

Onsite Meteorological Monitoring System

O OTSC

Onsite Technical Support Center

O ORAT

Operational Readiness Assessment Team (NRC)

O OSC

Operational Support Center

P PIP

Performance Incentive Plan

P PRP

Performance Recognition Program

P PSER

Physical Security Event Report

P PSP

Physical Security Plan

P PIMS

Plant Information Management System

P PIM

Plant Issues Matrix (NRC)

P PSRC

Plant Staff Review Committee

P PSDAR

Post-Shutdown Decommissioning Activities Report

P PSAR

Preliminary Safety Analysis Report

P PNAC

President's Nuclear Advisory Committee

P PVRC

Pressure Vessel Research Committee

P PCP

Process Control Program

P PD

Program Directive

P PAG

Protective Action Guide (exposure limits)

P PDR

Public Document Room

P PSD

Public Staff Division (of CPUC

P PUC

Public Utilities Commission

Q

Q-List (classification listing of structures, systems, and components)

Q QAPR

Quality Assurance Problem Report

Q QE

Quality Evaluation

Q

Quality Hotline

Q QPAR

Quality Performance Assessment Report

Q QPR

Quality Problem Report

Q QPSR

Quality Problem Status Report

R RETS

Radiological Effluent Technical Specifications

R REMP

Radiological Environmental Monitoring Program

R RRS

Radiological and Radwaste Services

R RATI

Readiness Assessment Team Inspection (NRC)

R

Region IV (NRC)

R RWQCB

Regional Water Quality Control Board

R RG, Reg Guide

Regulatory Guide

R RRG

Regulatory Review Group (NRC)

R RS

Regulatory Services

R RE

Resident Engineer (NRC)

R RCRA

Resource Conservation Recovery Act

R R

Roentgen

R Rem

Roentgen equivalent man

R R/hr

Roentgens per hour

R R/min

Roentgens per minute

S SCP

Safeguards Contingency Plan

S SER

Safety Evaluation Report

S SECY

Secretary (of NRC) papers

S SEC

Securities and Exchange Commission

S SIR

Security Incident Report

S SISIP

Seismically Induced Systems Interaction Program

S SPPR

Semiannual Plant Performance Review (NRC)

S SRO

Senior Reactor Operator

S

Severity Level I, II, III, IV, V violation

S STA

Shift Technical Advisor

S SOER

Significant Operating Event Report (INPO)

S SFPE

Society of Fire Protection Engineers

S SR

Special Report

S SWP

Special Work Permit

S SFPO

Spent Fuel Project Office (NRC)

S SRM

Staff Requirements Memorandum (NRC)

S

Staff (use initial cap when referring to NRC)

S SP

Standard Practice

S SRP

Standard Review Plan

S STS

Standard Technical Specifications

S ES (also OES)

State Office of Emergency Services

S SEAOC

Structural Engineering Association of California

S SSPC

Structural Steel Painting Council

S SSER

Supplement to SER

S SAFR

Supplier Audit Finding Report

S SER

Supplier Evaluation Report

S SALP

Systematic Assessment of Licensee Performance

T TER

Technical Evaluation Report (NRC)

T TMS

Technical Maintenance Services

T TRG

Technical Review Group

T TS, Tech Spec

Technical Specification

T TSIP

Technical Specification Improvement Program

T TSC

Technical Support Center

T TEMP

Thermal Effects Monitoring Program

T TSAR

Topical Safety Analysis Report

T TZ

Transaction Zone

U USCGS

U.S. Coast and Geodetic Survey

U USCEA

U.S. Council for Energy Awareness

U USGS

U.S. Geological Survey

U UL

Underwriters Laboratory

U UBC

Uniform Building Code

U UFC

Uniform Fire Code

U UPC

Uniform Plumbing Code

V

V-notch (hardness test)

W W

Westinghouse

W WEXTEX

Westinghouse Explosive Tube Expansion

W WOG

Westinghouse Owners Group

W WANO

World Association of Nuclear Operators

B

backdraft

B

backflow

B

backpressure

B

backseat (valves)

B

backup (noun or adj), back up (verb)

B BOP

balance-of-plant

B bbl/d

barrel per day

B bbl

barrel(s)

B

base load

B

basemat

B

baseplate

B BEPZ

basic emergency planning zone

B

bedrock

B BOL

beginning of life

B

beltline

B

beyond-design-basis (accident)

B

biaxial

B

bidirectional

B BeV

billion electron volts

B

bistable

B

biweekly

B

blowdown

B

blueprint

B bp

boiling point

B BWR

boiling water reactor

B

boiloff

B BCMS

boron concentration measurement system

B BCMS

boron concentration monitoring system

B BIT

boron injection tank

B BHP

brake horsepower

B

breakwater

B bldg

building

B

buildup (noun or adj), build up (verb)

B

built-in (adj)

B

burnup (noun or adj), burn up (verb)

B

bypass

C calc

calculation

C cal

calorie

C CRT

cathode-ray tube

C CSAT

caustic spray additive tank

C

centerline

C cm

centimeter(s)

C cm/sec

centimeters per second

C CCP

centrifugal charging pump

C CTE

change, test, or experiment

C

changeout (noun or adj), change out (verb)

C

checkerplate

C

checklist

C CVCS

chemical and volume control system

C C&RP

chemistry and radiation protection

C

cleanup (noun or adj), clean up (verb)

C CCTV

closed circuit television

C

closeout (noun or adj), close out (verb)

C

coastdown (noun or adj), coast down (verb)

C coeff

coefficient

C

cogenerate

C

cold leg

C CLT

cold leg thinning

C CWF

cold wall factor

C CZP

cold zero power

C CCS

commitment control system

C CCWS

component cooling water system

C CFW

condensate and main feedwater

C CST

condensate storage tank

C CFCU

containment fan cooler unit

C CHMS

containment hydrogen monitoring system

C CHPS

containment hydrogen purge system

C CSAS

containment spray additive system

C CSS

containment spray system

C CVI

containment ventilation isolation

C CVIS

containment ventilation isolation system

C CRDM

control rod drive mechanism

C CRDR

control room design review

C CRPS

control room pressurization system

C

cooldown (noun or adj), cool down (verb)

C CDF

core damage frequency

C CBLA

cost beneficial licensing action

C

cost-benefit

C

cost-effective

C

cost-plus

C

cost-reimbursable

C C

coulomb

C

countercurrent

C cpm

counts per minute

C CHF

critical heat flux

C

cross-check

C

cross flow

C

cross-reference

C

cross-section (adj), cross section (noun)

C

crossbar

C

crosstie

C

crosswind

C cc (or cm3)

cubic centimeter

C cfh (or ft3/hr)

cubic feet per hour

C cfm (or ft3/min)

cubic feet per minute

C cfs (or ft3/sec)

cubic feet per second

C cu ft (or ft3)

cubic foot

C cu in. (or in.3)

cubic inch

C cu m (or m3)

cubic meter

C cu mm (or mm3)

cubic millimeter

C cu yd (or yd3)

cubic yard

C Ci

curie

C

cutoff (noun or adj), cut off (verb)

C Hz or cps

cycles per second

D

database

D

deborate

D dB

decibel

D

defense-in-depth

D

defoaming

D DOF

degree-of-freedom

D Anddeg; or deg

degree (plane angle)

D Canddeg;;Canddeg;

degrees Celsius; Celsius degrees (for temperature change or difference)

D Fanddeg;;Fanddeg;

degrees Fahrenheit; Fahrenheit degrees (for temperature change or difference)

D K (anddeg; not used)

degrees Kelvin (absolute)

D Anddeg;R

degrees Rankine

D

demultiplexer

D DNB

departure from nucleate boiling

D DNBR

departure from nucleate boiling ratio

D DBA

design basis accident

D DBD

design basis document

D DBE

design basis earthquake

D DBT

design basis threat

D DBV

design basis vehicle

D DCN

design change notice

D DCP

design change package

D DCR

design change request

D DE

design earthquake

D DFE

design flood event

D

dew point

D

dewater

D DET

diagnostic evaluation team (NRC)

D dia

diameter

D DEG

diesel engine generator

D DG or D/G

diesel generator

D DBW

differential boron worth

D DP or delta P

differential pressure

D DPV

differing point of view (NRC)

D DPO

differing professional opinion (NRC)

D DRPI

digital rod position indicator

D dc

direct current

D dpm

disintegrations per minute

D dps

disintegrations per second

D DTC

doppler temperature coefficient

D DDE

double design earthquake

D DER

double-ended rupture

D

down time

D

downstream

D

downwind

D

drawdown (noun or adj), draw down (verb)

D DLF

dynamic load factor

D dyn

dyne

E EWS

early warning system

E EFPD

effective full power days

E EFPH

effective full power hours

E EFPY

effective full power year

E EMF

effective multiplication factor

E eff

efficiency

E EDM

electrode discharge machining

E EH

electrohydraulic

E EMI

electromagnetic interference

E emp

electromagnetic pulse

E emu

electromagnetic units

E emf

electromotive force

E e

electron

E e.u.

electron units

E eV

electron volt

E EDMS

electronic document management system

E

electrosleeving

E esu

electrostatic units

E el

elevation

E EARS

emergency assessment and response system

E ECCS

emergency core cooling system

E EDG

emergency diesel generator

E ENS

emergency notification system

E EOP

emergency operating procedure

E EPZ

emergency planning zone

E EPS

emergency power system

E EOC

end of cycle

E EOL

end of life

E

endpoint

E ESF

engineered safety feature

E ESFAS

engineered safety features actuation system

E EAC

engineering advisory committee

E ECN

engineering change notice

E ECO

engineering change order

E EWR

engineering work request

E EQ

environmental qualification

E ECG

equipment control guidelines

E EFPY

equivalent full power years

E est

estimate

E (and others)

et al

E etc.

et cetera (and so forth)

E et seq.

et sequentes (and the following)

E EAB

exclusion area boundary

E e.g.

exempli gratia (for example)

E exp

exponent, exponential

F fab

fabricate

F FAI

fail-as-is

F FC

fail-closed

F FO

fail-open

F

fail-safe

F FMEA

failure modes and effects analysis

F

feedwater

F FLB

feedwater line break

F ft

feet

F fpm

feet per minute

F fps

feet per second

F FCN

field change notice

F FCO

field change order

F FCR

field change request

F FCT

field change transmittal

F FCT

field correction transmittal

F FDR

field deficiency report

F

field-fabricated

F FIR

field installation request

F

field-routed

F

field-run

F fig.

figure (capitalize when specified)

F FHARE

fire hazards Appendix R evaluations

F FPS

fire protection system

F

fire water

F FWST

fire water storage tank

F

first-line (adj)

F

fishplate

F

fixed-fee (adj)

F FCV

flow control valve

F FD

flow diagram

F FIT

flow-indicating transmitter

F FI

flow indicator

F

flow-induced

F FT

flow transmitter

F

flowmeter

F

flowpath

F

flowrate

F

follow-up (noun or adj), follow up (verb)

F ft

foot, feet

F ft-lb

foot-pound

F ft-kip

foot-pound (thousands)

F FMEA

foreign material exclusion area

F

fossil-fueled (preferred over fossil-fired)

F fdn

foundation

F fp

freezing point

F freq

frequency

F FM

frequency modulation

F FHB

fuel handling building

F

fuel-to-cladding

F

full-length (adj)

F

full power (noun and adj)

F

full-scale (adj)

F

full-size (adj)

F

full-time (adj), full time (adverb)

G gal.

gallon(s)

G gpd

gallons per day

G gph

gallons per hour

G gpm

gallons per minute

G gps

gallons per second

G GTAW

gas tungsten arc welding

G G

gauss (unit of magnetic flux density)

G GDC

general design criterion

G GSI

generic safety issue

G G

giga- (10 9) (prefix)

G GHz

gigahertz

G GW

gigawatt

G GWh

gigawatt-hour

G GV

governor valve

G g-cal

gram-calorie

G gf

gram-force

G gmv

gram-molecular volume

G g

gram(s)

G g/cm3

grams per cubic centimeter

G g/L

grams per liter

G g

gravity, acceleration of

G GFFD

gross failed fuel detector

G

groundwater

H

half-life

H HCV

hand control valve

H

hands-on

H hav

haversine

H hdr

header

H HX

heat exchanger

H

heat-treated

H htr

heater

H HVAC

heating, ventilating, and air conditioning

H

heatup (noun or adj), heat up (verb)

H

heavy-duty (adj), heavy duty (noun)

H H

henry

H Hz

hertz (cycles per second)

H HCLPF

high-confidence-of-low-probability-of-failure

H

high-density (adj)

H HEPA

high-efficiency particulate air (filter)

H

high-energy (adj)

H HELB

high-energy line break

H hf

high-frequency (adj)

H

high-level (adj)

H HP

high-pressure (adj)

H HPCI

high pressure coolant injection

H HPSI

high pressure safety injection

H

high-temperature (adj)

H HTR

high temperature resistant

H hv

high-voltage (adj)

H

holddown (noun or adj), hold down (verb)

H

holdup (noun or adj), hold up (verb)

H hp

horsepower

H HCF

hot channel factor

H HFT

hot functional test

H

hot leg

H

hotwell

H hr

hour(s)

H HPES

human performance evaluation system

H

hydroelectric

H pH

hydrogen ion concentration

H

hydrotesting

I i.e.

id est (that is)

I id.

idem (the same)

I ITS

important to safety

I

in-depth (adj), in depth (adv)

I

in-house (adj)

I

in-leakage

I

in-line (adj)

I

in-phase (adj)

I

in-place (adj)

I

in-plant (adj)

I

in process

I

in progress

I

in situ

I in.

inch(es)

I in. /s

inches per second

I

incore

I ISFSI

independent spent fuel storage installation

I ITR

independent technical reviewer

I IPE

individual plant examination

I IPEEE

individual plant examination for external events

I IN

information notice

I

inservice

I ISI

inservice inspection

I ILT

inservice leak test

I IST

inservice testing

I ID

inside diameter

I I&C

instrumentation and controls

I

intake structure

I ICS

integrated communications system

I ILRT

integrated leak rate test

I ILS

integrated living schedule

I IPAP

integrated performance assessment process (NRC)

I

inter alia (among other things)

I IGA

intergranular attack

I IGSCC

intergranular stress corrosion cracking

I IOM

interoffice memorandum

I

intertidal

I

isophase

I INVDIO

issue needing validation to determine its impact on operability

J

jobsite

J J

joule

J JCO

justification for continued operation

K k

kilo- (103) (prefix)

K kandOmega;

kilo-ohm

K kcal

kilocalorie

K kCi

kilocurie

K kc

kilocycle

K kHz or kc/sec

kilocycles per second

K keV

kiloelectron volt

K kG

kilogauss

K kg

kilogram(s)

K kg/m3

kilograms per cubic meter

K kHz

kilohertz

K kJ

kilojoule

K kL

kiloliter

K km

kilometer(s)

K km/s

kilometers per second

K kVARh

kilovar hour

K kVAR

kilovar (reactive kilovolt-ampere)

K kV

kilovolt

K kVA

kilovolt-ampere

K kVAh

kilovolt-ampere hour

K kW

kilowatt

K kWe

kilowatt (electric)

K kWh

kilowatt-hour

K kWt

kilowatt (thermal)

K KE or T

kinetic energy

K kip

kip (1000 lb)

L

large-bore (adj)

L LERF

large early release frequency

L

large-scale (adj)

L lat

latitude

L

laydown

L Pb

lead (element)

L

lead time

L

leakoff (noun or adj), leak off (verb)

L

leakrate

L

leaktight

L

leaktightness

L

letdown (noun or adj), let down (verb)

L LCV

level control valve

L LI

level indicator

L LS

level sensor

L LT

level transmitter

L LAR

license amendment request

L LB

licensing basis

L LBIE

licensing basis impact evaluation (50.59 evaluation)

L

life-support (adj)

L LED

light emitting diode

L LS

limit switch

L LCO

limiting condition for operation

L lf

linear feet

L LVDT

linear variable differential transformer

L L

liter(s)

L LL

live load

L

loadout (noun or adj), load out (verb)

L LLRT

local leak rate test

L log (ln)

logarithm (natural)

L

long-term (adj)

L long.

longitude

L LOCA

loss-of-coolant accident

L LOOP

loss of offsite power

L

low-level (adj)

L LLW

low-level waste (but: very low level waste)

L

low-low

L LPZ

low population zone

L LPD

low power density

L LP

low-pressure (adj)

L LSA

low specific activity

L LTOP

low temperature overpressure protection

L LLD

lower limits of detection

L

lumenlm

L lm/W

lumens per watt

L

lump-sum (adj)

M MT

magnetic particle test

M MCES

main condenser evacuation system

M MCB

main control board

M MFW

main feedwater

M MFWP

main feedwater pump

M MSIV

main steam isolation valve

M MSLB

main steam line break

M MSSS

main steam supply system

M

makeup (noun, adj), make up (verb)

M

man-rem

M mgr

manager

M

manhour

M

manpower

M mfg

manufacturing

M

manways

M

margin of safety

M

markup (noun), marked-up (adj)

M max

maximum

M MPC

maximum permissible concentration

M Mx

maxwell

M MLLW

mean lower low water

M MSL

mean sea level

M M&TE

measurement and test equipment

M mech

mechanical

M M

mega- (106) (prefix)

M MCi

megacurie

M Mc

megacycle

M MHz

megahertz (megacycles per second)

M MV

megavolt

M MVA

megavolt-ampere

M MW

megawatt

M MWd/kgU or MWD/KGU

megawatt days per kilogram of uranium

M MWd/mtU or MWD/MTU

megawatt days per metric ton of uranium

M MWe

megawatt, electrical

M MWh

megawatt-hour

M MWt

megawatt, thermal

M MO

megohm

M MOA

memorandum of agreement (NRC)

M

metalclad

M MKS

meter-kilogram-second (system of units)

M m

meter(s)

M m/s

meters per second

M

mho

M :

micro- (10-6) (prefix)

M :A

microampere

M :A

microangstrom

M :C

microcoulomb

M :Ci

microcurie

M :F

microfarad

M :g

microgram

M :H

microhenry

M :L

microliter

M :m

micrometer

M :mho

micromho

M ::

micromicron (10-12 m)

M :M or :mol

micromole

M :

micron (10-6 m)

M :s

microsecond

M :V

microvolt

M :W

microwatt

M MOL

middle of life

M

midloop

M

midpower

M

midrange

M

midscale

M mph

miles per hour

M m

milli- (10-3) (prefix)

M mA

milliampere

M mCi

millicurie

M mF

millifarad

M mg

milligram(s)

M mH

millihenry

M mL

milliliter(s)

M mm

millimeter(s)

M mmho

millimho

M MCM

million circular mills

M MeV

million electron volts

M MV

million volts

M mRem

millirem

M mR

milliroentgen

M ms

millisecond

M mV

millivolt

M mW

milliwatt

M min

minimum

M MCHFR

minimum critical heat flux ratio

M MCPR

minimum critical power ratio

M min

minute(s)

M misc

miscellaneous

M MELB

moderate energy line break

M MTC

moderator temperature coefficient

M MSR

moisture separator-reheater

M mol wt

molecular weight

M MRS

monitored retrievable storage

M MCC

motor control center

M MG

motor generator

M MOV

motor-operated valve

M

multi-degree-of-freedom

M MPC

multi-purpose canister

M

multichannel

M

multiconductor

M

multiplex

M

multivariable

N n

nano- (10-9) (prefix)

N NR

narrow range

N

near-term (adj)

N NTOL

near-term operating license

N NPSH

net positive suction head

N n/cm 2

neutrons per square centimeter

N n/cm2 -sec

neutrons per square centimeter per second

N N

newton

N NDT

nil ductility temperature

N N

nitrogen

N NDD

no detectable degradation

N

no-load (condition)

N

non-1E

N

non-Q

N

nonaccident

N

noncondensable

N

nonconsumable

N NDE

nondestructive examination

N NDT

nondestructive testing

N

nonexistent

N

nongaseous

N

nonlinear

N

nonmanual

N

nonmarine

N

nonnuclear

N

nonpositive

N

nonradioactive

N NPTS

nonradiological permit tracking system

N

nonrecurring

N

nonregenerative

N

nonreversing

N

nonsafety-related

N

nonseismic

N

nonstructural

N

nonunion

N

nonvital

N NOP

normal operating pressure

N NOT

normal operating temperature

N N/C

normally closed

N N/O

normally open

N N/A

not applicable

N NTS

not to scale

N NIS

nuclear instrumentation system

N keff or keff

nuclear reactivity

N NSSS

nuclear steam supply system

N

number(s)no. (nos.)

O

oceanside

O

off-line (adj), off line (adv)

O

offgas

O

offshore

O

offsite

O AndOmega;

ohm

O OCB

oil circuit breaker

O OWS

oil-water separator

O

on-line (adj), on line (adv)

O OTSC

on-the-spot-change

O

one-dimensional

O

one-half

O

ongoing

O

onshore

O

onsite

O OE

operability evaluation

O OBA

operating basis accident

O OBE

operating basis earthquake

O OBI

operating basis incident

O OEA

operating experience assessment

O OL

operating license

O OP

operating procedure

O OVID

operating valve identification diagram

O O&M

operations and maintenance

O OOS

out of service

O OD

outside diameter

O ODSCC

outside diameter stress corrosion cracking

O

overcurrent

O

overemphasize

O

overpower

O

overpressurization

O

oversized

O OPC

overspeed protection control

O

overtemperature

O

overvoltage

P p (pp)

page(s)

P

part-time (adj), part time (adv)

P PID

partial initial decision

P PT

particle testing

P ppb

parts per billion

P ppm

parts per million

P Pa

pascal

P

pathway

P PCT

peak cladding temperature

P PGA

peak ground acceleration

P PGV

peak ground velocity

P PT

penetrant test (dye)

P %

percent

P PI

performance indicator

P PERS

personnel exposure records system

P p

pico- (10-12) (prefix)

P pCi

picocurie

P pF

picofarad

P

piperack

P

pipeway

P P&IS

piping and instrument schematic

P P&ID

piping and instrumentation diagram (drawing)

P PLEX

plant life extension

P PPR

plant performance review (NRC)

P PPT

plant performance template (NRC)

P PPC

plant process computer

P PPS

plant protection system

P

plant-specific

P PVC

polyvinyl chloride

P PCD

population center distance

P PDP

positive displacement pump

P

post-LOCA

P

post-accident

P PAM

post-accident monitoring

P PASS

post-accident sampling system

P PMT

post-maintenance test

P p.m.

post meridiem (after noon)

P

post-operational

P

post-tensioned

P PWHT

post-weld heat treatment

P PE

potential energy

P lb

pound(s)

P psi

pounds per square inch

P psia

pounds per square inch, absolute

P psid

pounds per square inch, differential

P psig

pounds per square inch, gage

P

power block

P PCB

power circuit breaker

P PF

power factor

P

power-operated

P PORV

power(pressure)-operated relief valve

P PR

power range

P PRNI

power range nuclear instrument

P

pre-award

P

preaccident

P

preamplifier

P prefab

prefabricated

P

prefilter

P

preinspect

P

prejob

P

preoperational

P

prepressurization

P PSI

preservice inspection

P

preset

P PTLR

pressure and temperature limits report

P PI

pressure indicator

P mm Hg

pressure (millimeter of mercury)

P PS

pressure switch

P PT

pressure transmitter

P PTS

pressurized thermal shock

P PWR

pressurized water reactor

P PRT

pressurizer relief tank

P PSRV

pressurizer safety relief valve

P PM

preventive maintenance

P PWSCC

primary water stress corrosion cracking

P PRA

probabilistic risk assessment

P POD

probability of detection

P POPCD

probability of prior cycle detection

P pe

probable error

P PMF

probable maximum flood

P PMP

probable maximum precipitation

P

procedure (capitalize when specific)

P PCD

procedure commitment database

P POA

prompt operability assessment

P PAB

protected area boundary

P PAS

public address system

P

pumpdown

P

punchlist

P PO

purchase order

Q QPTR

quadrant power tilt ratio

Q QTD

quadrant tilt difference

Q QBL

qualified bidders list

Q QSL

qualified suppliers list

Q QAP

quality assurance procedure

Q QA

quality assurance (when used generically)

Q QAF

quality audit finding

Q QC

quality control (when used generically)

R rad

radian

R rad/s

radian per second

R rad

radiation absorbed dose

R RCA

radiation control access

R RCP

radiation control procedure

R RCV

radiation control valve

R RMS

radiation monitoring system

R R(P)M

radiation (process) monitor

R RC

radiochemical

R RCA

radiological controlled area

R r

radius

R

radwaste

R RAM

random-access memory

R

rarefaction

R RWSR

raw water storage reservoir

R RCCW

reactor component cooling water

R RCL

reactor coolant loop

R RCPB

reactor coolant pressure boundary

R RCP

reactor coolant pump

R RCS

reactor coolant system

R RCIC

reactor core isolation cooling

R RPS

reactor protection system

R RTS

reactor testing system

R RTB

reactor trip breaker

R RTS

reactor trip system

R RVHVS

reactor vessel head vent system

R RVID

reactor vessel integrity database

R RVLIS

reactor vessel level instrumentation system

R RVRLIS

reactor vessel refueling level indication system

R ROM

read-only memory

R

readout

R

real time

R

reanalyze

R

recalibrate

R RMS

records management system

R

red-line

R

reenergize

R

reevaluate

R Ref., Refs.

reference(s)

R RWST

refueling water storage tank

R RH

relative humidity

R RAOC

relaxed axial offset control

R RCM

reliability centered maintenance

R RPE

replacement parts evaluation

R RAI

request for additional information (NRC)

R RFP

request for proposal

R RRS

required response spectra (equip. testing)

R

reracking

R

rerun

R RHRS

residual heat removal system

R RTD

resistance temperature detector

R RC

responsibility center

R

retrofit

R rev.

revision

R rpm

revolutions per minute

R rps

revolutions per second

R

riprap

R RCC

rod cluster control

R RCCA

rod cluster control assembly

R RPI

rod position indication

R rms

root mean square

R RPC

rotating pancake coil

R

runback

R

runoff

R

runup (wave)

S SSE

safe shutdown earthquake

S SFAS

safety feature actuation system

S SIF

safety identification factor

S SIS

safety injection system

S SPDS

safety parameter display system

S

safety-related

S SRV

safety relief valve

S SV

(safety)(solonoid)(stop) valve

S SSFAR

safety system functional audit and review

S SSFI

safety system functional inspection

S SSOMI

safety system outage modification inspection

S

saltwater

S

seawater

S SLUR

second level undervoltage relay

S sec

second(s)

S

section (capitalize when specific)

S SSI

security safeguards information

S SAM

seismic anchor movement

S

self-actuated

S

self-contained

S SCBA

self-contained breathing apparatus

S

semiannually

S

semimonthly

S SMM

senior management meeting (NRC)

S SW

service water

S

setpoint

S

shaker-table

S G

shear modulus

S

shearwall

S

shelf-life

S SMAW

shielded metal arc welding

S SFM

shift foreman

S

shop-fabricated

S

shoreline

S

short circuit

S

short-term (adj)

S SDM

shutdown margin

S

shutdown (noun or adj), shut down (verb)

S

shutoff (noun or adj), shut off (verb)

S

sic (so, thus)

S S

siemens (unit of conductance)

S

sign-off (noun or adj), sign off (verb)

S

single-degree-of-freedom

S

site-specific

S

small bore

S

small-scale (adj)

S SSI

soil-structure interaction

S

sole-source (adj)

S

solid-state (adj)

S SSPS

solid-state protection system

S sp gr

specific gravity

S SCN

specification change notice

S SA

spectral acceleration

S SFP

spent fuel pool

S SAT

spray additive tank

S sq (or2 )

square

S cm2 (or sq cm)

square centimeter

S ft2 (or sq ft)

square foot

S in.2 (or sq in.)

square inch

S km2

square kilometer

S m2

square meter

S m2 /s

square meter per second

S mm2

square millimeter

S SRSS

square-root-of-the-sum-of-squares

S yd2 (or sq yd)

square yard

S ss

stainless steel

S std

standard

S scf

standard cubic feet

S scfh

standard cubic feet per hour

S scfm

standard cubic feet per minute

S scfs

standard cubic feet per second

S std dev

standard deviation

S SOP

standard operating procedure

S STP

standard temperature and pressure

S SGTS

standby gas treatment system

S SU

startup (noun or adj), start up (verb)

S

state-of-the-art (adj)

S SBO

station blackout

S SPCS

steam and power conversion system

S SG or S/G

steam generator

S SGTR

steam generator tube rupture

S

steam line

S St

stokes

S SIF

stress intensification factor

S

strike-slip (adj)

S SSC

structures, systems, and components

S

sua sponte (voluntarily)

S

sub rosa (privately, in secret)

S SMM

subcooling margin monitor

S

subsection

S

subsurface

S

subsystem

S

subtidal

S supra id.

supra idem (the same as above)

S STP

surveillance test procedure

S

switchgear

S

switchyard

S SVT

systems verification test

T TCV

temperature control valve

T TI

temperature indicator

T TAM

thermal anchor movement

T TDC

thermal diffusion coefficient

T TC

thermocouple

T TLD

thermoluminescent dosimeter

T TLC

thin-layer chromatography

T k

thousand

T keV

thousand electron volts

T

three-step

T

time-history

T

to date

T

ton (spell out)

T tpd

tons per day

T tpy

tons per year

T

tornado-borne

T TDH

total dynamic head

T TEDE

total effective dose equivalent

T TSP

tube support plate

T

tubesheet

T TIG

tungsten inert gas (welding process)

T TB

turbine building

T TBS

turbine bypass system

T TDAFW

turbine-driven auxiliary feedwater (pump)

T TG

turbine generator

T TPS

turbine protection system

T

turnover

U UHS

ultimate heat sink

U UHF

ultrahigh frequency

U UDRPS

ultrasonic data recording and processing system

U UT

ultrasonic testing

U uv

ultraviolet

U

underfrequency

U

undersized

U

undervoltage

U UPS

uninterruptible power system

U URI

unresolved item

U USI

unresolved safety issue

U UEQ

unreviewed environmental question

U USQ

unreviewed safety question

U

upender

U U

uranium

V VBS

vehicle barrier systems

V v

velocity

V VHF

very high frequency

V VLF

very low frequency

V VLPM

vibration and loose parts monitor

V viz.

videlicet (namely)

V V

volt

V VA

volt-ampere

V VAR

volt amps reactive

V V/m

volt per meter

V Vac

volts, alternating current

V Vdc

volts, direct current

V vol

volume

V VCT

volume control tank

V vpm

volume parts per million

V v/v

volume per volume

V vol % or v/o

volume percent

W whse

warehouse

W

washout (noun), wash out (verb)

W WHAT

wastewater holding and treatment

W

water-cooled

W W

watt

W Wh

watt-hour

W Wb

weber

W wt

weight

W wt % or w/o

weight percent

W W/V

weight-to-volume ratio

W W/W

weight-to-weight ratio

W WPS

welding procedure specification

W WL

wind load

W wo

work order

W

workload

W

worst-case (adj), worst case (noun)

Y yd

yard(s)

Z ZPA

zero period acceleration (ground acceleration)

Z ZOI

zone of influence